#include <stdio.h>

float max(float x,float y)
{
	return(x>y?x:y);
}

int main()
{
	float a,b,c;
	printf("input three num a,b,c:");
	scanf("%f%f%f",&a,&b,&c);
	printf("max=%f\n",max(c,max(a,b)));
	return 0;
}
